/*
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 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

package Filter;

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 *
 * @author Gjun
 */
public class CheckLogin extends HttpServlet {

    /**
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code>
     * methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        try {
            /* TODO output your page here. You may use following sample code. */
            out.println("<!DOCTYPE html>");
            out.println("<html>");
            out.println("<head>");
            out.println("<title>Servlet CheckServlet</title>");            
            out.println("</head>");
            out.println("<body>");
            out.println("<h1>Servlet CheckServlet at " + request.getContextPath() + "</h1>");
            out.println("</body>");
            out.println("</html>");
        } finally {
            out.close();
        }
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        //processRequest(request, response);
        response.sendRedirect("login.jsp");
    }

    /**
     * Handles the HTTP <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        //processRequest(request, response);
        HttpSession session=request.getSession();
        String user=request.getParameter("user");
        String paswd=request.getParameter("paswd");
        String captcha=request.getParameter("captcha");
        String paswdans=null;
        DAO d=new DAO();
        try{
            paswdans=d.account(user);
        }
        catch(Exception e){}
        String captchaans=session.getAttribute("randomString").toString();
        if(checkEmpty(user) || checkEmpty(paswd) || checkEmpty(captcha)){
            request.setAttribute("errmes", "您漏掉資料");
            RequestDispatcher rd = request.getRequestDispatcher("login.jsp");
            rd.forward(request, response);
            //request.getRequestDispatcher("mvc1.jsp").forward(request, response);
        }
        if(captcha.equals(captchaans)){
            if (!paswdans.equals("")){
                if(paswdans.trim().equals(paswd)){
                    //java.util.HashMap map =new java.util.HashMap();
                    //map.put("user", user);
                    //map.put("paswd", paswd);        
                    session.setAttribute("person", user);
                    request.getRequestDispatcher("carlist").forward(request, response);
                }
                else{
                    request.setAttribute("errmes", "密碼錯誤");
                    RequestDispatcher rd = request.getRequestDispatcher("login.jsp");
                    rd.forward(request, response);
                }
            }
            else{
                request.setAttribute("errmes", "無此帳號");
                RequestDispatcher rd = request.getRequestDispatcher("login.jsp");
                rd.forward(request, response);
            }
        }else{
            request.setAttribute("errmes", "驗證碼錯誤");
            RequestDispatcher rd = request.getRequestDispatcher("login.jsp");
            rd.forward(request, response);
        }
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>
    
    
    boolean checkEmpty(String str){
        boolean f1 =false;
        if(str==null)
        {
            f1=true;
            return f1;
        }
        else if(str.trim().equals(""))
        {
            f1=true;
            return f1;
        }
        return f1;
    }
}
